Influence of tau_t, tau_p values in thermostat, barostat during equilibration

GROMACS version:2020.1
GROMACS modification: Yes/No
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How tau_t, tau_p values in npt.mdp values can influence the output of the simulation ?I mean how can user define the values for an arbitrary system ? As for e.g: for lysozyme tutorial, for NVT equilibration, tau_t=0.1 ps was used, in NPT tau_t=0.1, tau_p=2 ps were used. How can one determine the values ?